Factor out tables into data/overworld/

Fixes #749

data/tilesets.asm

@@ -1,51 +0,0 @@
-tileset: MACRO
-	dba \1GFX, \1Meta, \1Coll
-	dw \1Anim
-	dw NULL
-	dw \1PalMap
-ENDM
-
-; Associated data:
-; - The *GFX, *Meta, and *Coll are defined in gfx/tilesets.asm
-; - The *PalMap are defined in gfx/tileset_palette_maps.asm
-; - The *Anim are defined in engine/tilesets/tileset_anims.asm
-
-Tilesets::
-; entries correspond to TILESET_* constants
-	tileset Tileset0
-	tileset TilesetJohto
-	tileset TilesetJohtoModern
-	tileset TilesetKanto
-	tileset TilesetBattleTowerOutside
-	tileset TilesetHouse
-	tileset TilesetPlayersHouse
-	tileset TilesetPokecenter
-	tileset TilesetGate
-	tileset TilesetPort
-	tileset TilesetLab
-	tileset TilesetFacility
-	tileset TilesetMart
-	tileset TilesetMansion
-	tileset TilesetGameCorner
-	tileset TilesetEliteFourRoom
-	tileset TilesetTraditionalHouse
-	tileset TilesetTrainStation
-	tileset TilesetChampionsRoom
-	tileset TilesetLighthouse
-	tileset TilesetPlayersRoom
-	tileset TilesetPokeComCenter
-	tileset TilesetBattleTowerInside
-	tileset TilesetTower
-	tileset TilesetCave
-	tileset TilesetPark
-	tileset TilesetRuinsOfAlph
-	tileset TilesetRadioTower
-	tileset TilesetUnderground
-	tileset TilesetIcePath
-	tileset TilesetDarkCave
-	tileset TilesetForest
-	tileset TilesetBetaWordRoom
-	tileset TilesetHoOhWordRoom
-	tileset TilesetKabutoWordRoom
-	tileset TilesetOmanyteWordRoom
-	tileset TilesetAerodactylWordRoom